Web Reference: Feb 22, 2011 · With null you use it generally to erase the contents of a variable, with undefined it generally comes with input when there hasn't been set a value yet. Jul 23, 2025 · undefined indicates a variable hasn’t been initialized, while null is intentionally assigned to indicate no value. Understanding the distinction helps write cleaner, more predictable code in JavaScript, especially when handling default values or checking for missing data. Mar 31, 2024 · Although undefined and null have some functional overlap, they have different purposes. In the strictest sense, null represents a value intentionally defined as "blank," and undefined represents a lack of any assigned value.
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